'Fitting' in the Bible

Do not let unwholesome [foul, profane, worthless, vulgar] words ever come out of your mouth, but only such speech as is good for building up others, according to the need and the occasion, so that it will be a blessing to those who hear [you speak].

But sexual immorality and all [moral] impurity [indecent, offensive behavior] or greed must not even be hinted at among you, as is proper among saints [for as believers our way of life, whether in public or in private, reflects the validity of our faith].

Let there be no filthiness and silly talk, or coarse [obscene or vulgar] joking, because such things are not appropriate [for believers]; but instead speak of your thankfulness [to God].